Originally Posted by winn442
You can use a 4.0, there was a front cover called the "intermediate" cover that allowed the use of the newer block with the crank driven oil pump with a distributor. I think it was used only a year or so on the 4.2's.
On the cam, if you don't want to spend the money, you can use an aftermarket adjustable timing chain set designed for the 3.8 buick. (which I would use regardless over the factory timing set anyway, much more robust). Advancing the cam 3 degrees with the adjustable timing chain set will give you basically the same cam profile as a 4.6 cam or an aftermarket cam.
Winn the front cover you are referring to is found on the 1994-1995 Discovery (3.9) and the 1995 Range Rover Classic (3.9 and 4.2) were serpentine belt drive and had distributor ignition. Bill, that's why I mentioned the parts trucks I have. I have 4 complete 3.9 serpentine belt 14CUX engines in stock and I would LOVE to get rid of some of this stuff...
I like the rollmaster CS7000 timing chain but it requires a little clearance to work.